marc-ellot



P. MARCELLUT.

CHANGE SPEED (BEARING.

APPUCA'HUN mu: K011111112.

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P. MARCELLOTt CHANGEVSPEED (BEARING. APPLICATION FILED NOV. 14, 1912.

Patented Aug. 22, 1916.

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CHANGE SPEED GEARiNG.

APPLECATKON man NOV. 4. 1912.

1 ,1 95,83 1 Patented Aug. 22, 1916.

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CHANGE SPEED (BEARING.

APPLICATION FILED NOV 14, 1912.

Patented Aug. 22, 1916.

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CHANGE SPEED GEARING Patented Aug. 22, 1916.

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APPLICATION FILED N0v414,19|2. V 1,1 95,831 Patented Aug. 22, 1916.

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{79% BY W P. MARCELLOT.

CHANGE SPEED GEARNG.

APPLICAHON FILED NOV. 14, 1912.

Patented Aug. 22, 1916.

7 SHEETSSHEET I.

WI T/VESSES T P IL Z NP m W, 5 P R E P PIERRE MARCELLOT, OF PARIS, FRANCE.

CHANGE-SP ED GEARING.

Application filed November 14, 1912. Serial No. 731,874.

To all whom it may concern:

Be it-known that I, PIE RE 1\fi-A1ior11:.r .o'r of (50 Rue des Marais, in the city of Paris, Re-- public of France, engineer, have invented a Change-Speed Gearing, of which the follow- I ing is a full, clear, and exact description.

The invention relates to a' change. Speed gear allowing to obtain'a variation of the speed from the minimum speed up to the maximum speed.

This change speed gearing is essentially characterized by a toothed -pinion having either the shape. of a solidl'o'i revolution, or being conical or plane, this pinion being provided with teeth the hui' ber of which de-f creases from the part oflt, e pinionrtarthest from the axis of rotation-to the partnearest to said'iaxis. This pinion gears with a second toothed pinion, that [may be moved relatively to the first, sb to bring it in gear with a region of the first pinion provided withia greater or less number of teeth, thus modifying the speed.

The invention isfhrthercharacterized by the method of forming the teeth of the first pinion; These teeth have the shape of lozenges limited by two series of parallel waysserving as passages for the, teeth of the seednd'pinion. By: means of this arrangement, the position of the movable pinion may be modified at any moment during the operation of the change speed gearing.

Finally the invention is characterized y a combination of two pinions, having a variable number of teeth, as above set forth, with a pinion simultaneously gearing Wi'zll the two preceding ones; this latter pinion is capable of being movedrelatively to the first pinions for changing the speed.

The invention is illustrated by way of ex= ample only in the accompanyingdrawings in which:'

Figure 1 is a vertical section of one form of the improved change speed gearing; Fig. 2 is asection made on line A- A of Fig. 1; Fig. 3 is a similar section, showing a modification; Figs. 4 and 5 are respectively an elevation curtain underside plan view of the pinion having a variable number of teeth; Figs. 3 and illustrate res ectively in eleva tion and underside-plan view a pinion hav-- variable number of teeth simultaneously gearing witha third toothed'pinion; Fig. 9

[ -Specification of Letters Patent. Patented Aug, 22,]:916, I

ing. lozenge shapedteeth Fig. 8- illustrates the combination of two pinions having a is a section made.- online B'-B. of Fig. 8; 7

Figs." :and 11"are two diagrammatical views disclosing the operation of this latter arrangement; Fig. 12 shows in elevation'a" modification of the new change speed gear;

Fig. 13 illustrates an application of the pre-' ceding arrangement; FigL' 14f1S a section 16 on the one handland 17 onfthe other hand relate to modifications.

As-illustrated in the drawings (Ki .'1) a pinion, constituted by a toothed-diii a-is mounted in a cup b so. as'to be capable .of

rotating about its. center and .in-its plane.*-'

The cup I; is provided with tw'otrunnions 0- cthe axis of which isat. right angles to the axis of rotation of'the dis a, and said tl'unnions; can rotate in bearingsv d; d. A

lever g'rigidlymounted on the trunnion 0" allows of v rying at. will the inclination of the cup and, consequently, of the disk 11. The operating shaft fjis'ar'ranged in the plane perpendicular to the axis of .the trunnions c c and passing through the center of the disk 0.. On this shaft is rigidlymounted a toothed pinion gearing with the disk-a and the profile 0 4 circumference having its centeron the axis 0 of the trunnions c c. On the pinion g are;

traced suitably inclined teeth. iThese teeth which is a portion of a extend from the wide base of the pinion and a certain number of'them end at greater or less distances from this base; so that; for" instance, the pinion g has a number of teeth.

three times greaten atits widest base at its narrowest part.

It will at once be understood that. 'accord- I 7 ing to the inclination given to the disk a, by

means of the levere the latter gears with a part of the pinion having a more or less great diameter and, consequently, the disk a receives, from the operating shaft f, a more or less rapid rotary movement. I i

The movement of the disk a is imparted to the receiving shaft k by means of a uni- .versal coupling; In the drawings this can; phngis illustrated in the form-of a ball and socket'joint. The end Not the shaft h is a sphere having its'center on the axis of the trunnions G'endon the axis-of rotation of .thei'disk m Said' sphere fits into a spherical recess provided in t'he-disk at so that the shaft f is hin'gedjon the disk-by means of a kind of ball .am i' socket joint.

The sphere has a groove z .in' which fit pin sj secured within the spherical recess of the disk (1,. These pins allow thedt'sibg to drive thesphere h I while ,perinittingthedisk to take anyjnclination. whateverlrelatively to the shaft h.

Fig; :31Ishows a; modificationof this connectionidiri' ewhich the ball is aotuatedhya plfl I Qt'thedish a, .which passes" "th rough a "$1 formedaocording'to a diametriital f he sphere ft, asill'iistrat'ed. J The wine on between the disk 'al ancl' the shaft be also eile'c'te l 'by providing the sphere v the lg'itter 't o' inolin'e' in any ever relat'ivelVi-to, said shaft; V

It is et; course to be understood that the device can be reversed and"; that the shaft it vcan-be the driving shaft and theshaft' f the i 1 driven shaft.

The shape anti .thelteeth of which will beeeonvenien't for the majority of'cases. "The teeth ofthe pinion present acertain "inclinationrelatively to the planes passing throughjthe'axis' ofrotation p. In

the example illustrated, at each point of the edge-eta toothg the angle between the tan- -.,ge-nt toone'--edgeian(l the tangent tothe meridian-line ofthe solidfof revolution constitutingth'epinion 20. This angle may X varyac'cordihgto .thelsize'sof' the pinion g .1

and disk :a the maximum and minimum speeds, eto, in-the' variousapplications of in projeotion'relativelytqthe' radii 'r'ot the I circumference- (-Fig. i Between these i thejimproved-bhange speed "gearin'm- Ill-H162 example illnst'ratedinthe drawingS, the pinion-comprises a. series of teeth '50 m,-'-uniformly:space d epsrt, inclined at 20 teethar'e arranged othe'rflteeth n and 0. par

projection by curves 8', tparallel' tothe futallel'to thelformer; the ends of the teeth whicharenearest the axis,- are limited in lowing teeth mg' the intervals are equal to I the intervals u. According to circumstances,

=clined.

the teeth can "beinclined in tion to that illustrated.

' {In the arrangement shown in Figs; 6 m1- 7, the main pinion isprovided with teeth m uniformly spacedapart and similarly i n Between said teeth are arranged teeth at 0 'p, parallel to-the former. The

I --"a.n'd-its'ohamher in the dish a with sim-ilarto those'of the pinion g and so arranged as t 0'j nsi1r'e' the'actuation of the ts'haftkjb .Ivme'a'ns;of'th'e'disk, while allowing direction: what-- y I the pinion 9 may vary according to-theapphcations. Figs. 1 .4 and 5-il'ln'strate ani'arrangenient of teeth a reverse (lireoteeth n 0 p are intersected'hy 'Ways it having il fi'ltii-ll equal to the interval between the teeth and parallel to the following teeth m, while the teeth 'in are intersected by ways 3/ parallel to the preceding teeth m. It results therefrom that instead ofpresenting continuous teeth. the pinion has'series of teeth;

having the shape of lozenges of different,

faoe of the solid. In the example shown Hi" the drawings the lo'ziei'iges of the etlge' are, ntersected by sizes according: to their location on the sur-- the plane which liniitsth solid of re 'olu 'f tion, that they arere'ilucedi to triangles.

According to CiI'C'l'tiiStii-DCQS, said lozenges can remain entire. any caseQby meansof this arrangen'ieiit vhatevermay he thefrep .tive positions of the pinion and of the rlislt'in gear withthe same. the teeth the latter can always pass on the pinion, \i'hen the (lisk is mo veclfor changing the speed The inclination e'f'the teeth yary from O to 45.

The arrangement illustrated in Figsifl m 11-, while insuring the variation'of'the peed, according to the principle of the invention, presents this essential advantage thatit at lows to obtain verv speedreducingratios. 7

As illustrated in Figs. 8 to. l1,'the-trans-' mission of movement from the. driving shaft great gear ratios and-- f to the tiriveii shafth is eiieeted by means of two similar nihions {1.9" siin'i ltaneously 'gearir'ig with a rotary toothed disk a The two pinionsg and g areisimilar to the"pre'-,

ceding pinion 0, but the teeth are prefer-- ahly formed as Se 3 forth with I reference to Figs. 6 anti 7 gand g" indicate pulleys rigidly inount 4 ed on the shafts of these pinions hut itis to be understood that the fts f anillz-fran be connected to the (l riving and driven 'meifF hers in any suitable manner. The profile of the pinions (1' q consists in arcsof circle'sof the s aine radiusymql huvinga's common centnn t he point 0. Thetlish (r is mounted on an axis v t supportetlhy case (Fig 9) that may he turned hy means of a driving lever The three axes: of the the (lirmtion in which the dish-(i is set is modified. it gears with a greater mimherof in'ions and of the disk :7, are in'the same plane.- lVhen teeth on of the minions and :7

time when the pinion g efi'eots one revolution. the disk of eiiect's also one revolutioni less on the other. 7 Assume the dish 'a' is in one of itsextreme' positions." In this 9051- 1 disk a makes a revolution. Concerning the pinion y, it rotates, in this case, at the same h; slots, and a long key, force the shaft h speed as the disk a, that is to say it makes revolution. The gear ratio, obtained by the improved device, varies therefore from n to revolution The total variation is therefore equal to if. For instance, for one revolution of g, there IS four revolutions of g or of revolution of g. The total variation of gearratio is therefore in the proportion of 1 to 16.

' In the middle position illustratedin Fig. 8, the speed of g is equal to that of g. In,

the intermediate positions between the two extreme positions, the ratio of the speeds takes any value between 1 and n, that is 1 to 16 in the example given.

In the arranger; iii, illustrated in Fig. 12, the improved chin 'w speed gearing coin prises a bevel pinion g and a spur pinion (,L gearing the one with the other. The pinion g is rigidly mounted on the driving shaft 1; the pinion a can slide along the driven shaft to rotate with the pinion a. The pinion a is an ordinary pinion, but the pinion g is provided with lozenge shaped teeth q, ob-

tained by tracing on the conical surface of the pinion generatrices 1, 1 uniformly dis- 35- tributed on said conical surface and lines 2, 2 parallel to the preceding generatrices and intersecting the same by lines 3, 3 parallel to the following generatrices.

It will be understood that if the pinion a is moved in the direction of the arrow 1" by means of a fork or by any other suit- .able means, this pinion comes in contact with a smaller number of teeth of the pinion 5/ for one revolution of this pinion. The speed of the shaft ."1 ihrrei'ore tier-wasted. Iteverscly, hy mining the pinion r/ in the. direction of the arrow i, said pinion brought in contact with the widest part of the pinion 1 the speed is increased..-

Fig. 13 shows an application of the invention. The device illustrated comprises two similar pinions r; and ,7 symmetrically arranged and. with which siniullaneously If said pinion is moved in the reverse diree having tion, the maximum speed is obtained. In

this example, there is a double speed reducing ratio or a double gear ratio. It the variation of speed produced by a pinion is from 1 to 4, the total variation is of l to 16. It will be noted that, in this arrangement, the transmission of movement is effected from a shaft f to a shaft h parallel to the former.

Figs. 15 and 16 illustrate a modification in which a plate the surface of which is a limit of the preceding cone is substituted for the pinion f]. The teeth of this plate are obtained in the same way as previously (Fig. 12). This arrangement allows of the transmission of speed from a driving; shaft f to a. driven shaft h at right angles to the former.

Fig. 17 relates to another modification in which one of the pinions is spherical; this pinion is mounted on a ball 0 by means of which the direction in which it is set can be modified. It is therefore possible to bring in contactwith the pinion (1 av part of the sphere rotating at a greater or less speed.

The above arrangements are given only by way of examples; the forms, sizes and detail arrangements may be varied without modifying the principle of the invention.

Claims:

" 1. In a change speed gearing a pinion, provided with lozenge-shaped teeth the number of which! decreases progressively from the part farthest from the axis of rotation to the part nearest said axis, a second pinion gearing with the first pinion. and means for nlovinp the second pinion for putting it into gear with a part of the first pinion provided with a. zff'mtcr or lesser nuiuher of teeth.

2. In a change speed gearing; a pinion lozenge-shaped t rth, a second pinion gearing with thr first pinion, and means tor lllUVlll ZI ll? second pinion for putting i 5am year a. i 3 pinion prodded with 51 nuniher oi trQi-li.

3*". in n hangv sprcd grazing. a conical gear, the t eth of which are lounge-shaped and of diliurent sizes, said teeth decreasing in number progressively from the larger to the smaller end thereof, a pinion gearing uith the said gear, and swans fwthe pinion relatively to Milli Joni-ml 4. In a change speed the teeth oi: which dc; gressively from the large; end thereof. av rocking. siuiporr. and a mounted in the support and the said conical gear.

In a change speed rea gear, thev teeth of uhiih it her. progressively from smaller end thereof. a I

er a r pinion int-sla n with l0 angles: to the n,

axis of rownon at rightangles in the axis about which Hm suppm rod I14, said pinmu meshing with the said conical gent.

' 3. In :1 vhzulgv we? gemin y :1 mnicwl ,QOzll. the teeth of whiz'h 21H: 11 n wsimin'wi and dw-rmzxe in numb?! pmgmmwly fn-w the larger tn Mm smniiw pmi the: a5 51 making mp -r! and :2 f

the suppm'! with its nxn: 21

n grwsr ml in me "ins 31% day :11 Ucmtmr 191). 15

(fume, H. Tunney], 

